log.java

java 调用windows的api

package org.jawin.browser.log;

import org.jawin.browser.config.ConfigManager;

import java.io.*;
/**
 * <p>Title: Jawin Code Generation GUI</p>
 * <p>Description: GUI for exploring type libraries and generating Java code</p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: Open Source Incentive</p>
 * @author Josh Passenger
 * @version 1.0
 */

public class Log
{
	private static Log instance = null;

	private static final String DEBUG = "[DEBUG] ";
	private static final String EXCEPTION = "[EXCEPTION] ";

	private boolean debug = ConfigManager.getInstance().getBoolean("log.debug");
	private boolean console = ConfigManager.getInstance().getBoolean("log.console");
	private boolean exception = ConfigManager.getInstance().getBoolean("log.exception");

	private Log()
	{
	}

	public static synchronized void initialize()
	{
		instance = new Log();
	}

	public static Log getInstance()
	{
		if (instance == null)
		{
			throw new IllegalStateException("Log.getInstance() Log was not initialized");
		}

		return instance;
	}

	public void debug(String message)
	{
		if (debug)
		{
			String logMessage = makeMessage(DEBUG, message);
			logConsole(logMessage);
		}
	}

	public void exception(String message, Exception e)
	{
		if (exception)
		{
			String logMessage = makeMessage(EXCEPTION, message, e);
			logConsole(logMessage);
		}
	}

	private void logConsole(String message)
	{
		if (console)
		{
			System.out.println(message);
		}
	}

	private String makeMessage(String logType, String message)
	{
		StringBuffer buffer = new StringBuffer(logType.length() + message.length());

		buffer.append(logType).append(message);

		return buffer.toString();
	}

	private String makeMessage(String logType, String message, Exception e)
	{

		StringWriter writer = new StringWriter();
		PrintWriter printWriter = new PrintWriter(writer);
		e.printStackTrace(printWriter);

		StringBuffer buffer = new StringBuffer(logType.length() + message.length());

		buffer.append(logType).append(message).append("\n");

		buffer.append(writer.getBuffer().toString()).append("\n");

		return buffer.toString();
	}


}